Valved piston.



' No. 683,394. Patnted Sept. 24, I90l.

s. m. ru|.mu.

vALvEn PISTON.

(Application mod w. 24, 1900.

UNITED STATES PATENT OFFICE.

SAMUEL M. FULTON, OF GALT, CALIFORNIA, ASSIGNOR OF ONE-HALF T6) ALDEN T. AMES, OF SAME PLACE.

'VALVED PISTON.

SPECIFICATION forming part of Letters Patent No. 683,394, dated September 24, 1901. Application filed September 24:, 1960. Serial No. 30.973. (No model.)

.7 0 all whom it may concern.-

Be it known that I, SAMUEL M. FULTON, a citizen of the United States, residing at Galt, in the county of Sacramento, State of California, have invented certain new and useful Improvements in Valved Pistons, of which the following is a specification, reference being had therein to the accompanying drawrugs. 1

This invention relates to valved pistons for pumps or similar structures, and particularly to a form having two seats and embodying a hollow piston or plunger.

The invention has for its object to provide a structure of valved piston having two independent seats for the valve or clapper thereof and permitting the maximum amount of space in the passages through the piston for liquid, while the strain thereon is placed vertically upon the metal com posing the valveseats. L

The invention has for a further object to provide an improved construction of clapper adapted to permit the passage of Water through the same and also to codperate with two valve-seats disposed upon different horizontal planes, whereby the water may pass freely through the piston and material resistance to the movement of the same through a body of liquid is prevented.

Other objects and advantages of the invention willhereinafter appear in the following description and thenovel features thereof will be particularly pointed out in the appended claims.

In the drawings, Figure 1 is an elevation of a double-piston pump to which my improved valve has been applied. Fig. 2 is an enlarged section of the upper piston shown in Fig. 1. Fig. 3 is a cross-section on the line 3 3 of Fig. 2. Fig. 4 isa similar view on the line 44 of Fig. 2. Fig. 5 is a similar view on the line 5 5 of Fig. 2, and Fig. 6 is a cross-section on the line 6 6 of Fig. 1.

Like letters of reference indicate like parts throughout the several figures of the drawings.

This improved valved piston is applicable to any desired form of pump or piston; but for the purpose of clearly illustrating the effective operation thereof I have shown the same in connection with the pistons of a double-pistoned pump, wherein the pistons move alternately toward and from each other. In such a structure of pump the lower piston or plunger is reciprocatedby means of the rod A, while-the upperpiston is similarly op erated by means of the hollow sleeve B,wl1ich is moved independently of the rod A, as is well known in this class of devices.

- As illustrating one method of mounting my improved piston, I have applied upon the lower end of the sleeve B a coupling-head C, which is interiorly threaded at its upper portion to engage the sleeve and similarly threaded at its lower portion to receive the upper end of a hollow stem D, through which the rod A of the lower piston passes. The lower end of this stem D is likewise exteriorly threaded and is adapted to fit into a socket G, carried at the upper portion of the valvefra'me G, and by this means said valve-frame is supported and moved with the sleeve B.

The lower portion of the valve-frame G is cylindrically formed, as shown at G for the purpose of receiving a packing, to be hereinafter described, and the socket G is connected to this portion by means of ribs H, which extend laterally inward from thecylindrical portion G and form a guide for the movement of the piston upon the rod A. At the upper end of the socket G of the valve-frame a suitably-ground valve-seat I is provided, which extends annularly of the stem D, while at the upper portion of the cylindrical part G of the valve-frame an annular seat J is provided, which is concentric to the seat I and in a horizontal plane below the same. Oooperatingwith these valve-seats a clapper or valve K has been provided, which is formed with an inturned flange K, adapted to rest upon the seat I, and a contact-face K at its lower end, adapted to rest upon the seat J, thus pro viding two independent valve-seats adapted to support the body of water carried by the piston in its upward movement, and also placing the strain upon the ribs and parts of the piston in a direct vertical line, which prevents the frequent breaking and disarrangement of the parts heretofore experienced. This clapper K reciprocates in the movement of the piston, and the upward movement there of is limited by means of a series of lugs L, which engage the lower face 0' of the'head O to limit the upward movement of the clapper when the piston is moving downward, and also to leave a free passage L for the liquid passing through the upper portion of the clapper. These lugs extend. inward, so as to guide the movement of the upper part of the clapper upon the periphery of the stem D, while the movement of the lower portion of the clapper is guided by the edge of the ribs H, which extend upward at intervals along the sides of the socket G of the valve-frame.

For the purpose of providing suitable water-tight piston connection between the outer face of the cylindrical portion of the piston and the casing within which it is operated I have provided a series of packings M, preferably cup-shaped, the upper one of which is clamped into contact with a shoulder G upon the valve by means of a clamping-ring M,

threaded upon the exterior of the cylindrical valve body, which ring is provided at its lower portion with a shoulder M for the purpose of clamping a succeeding packing M in a similar manner bya following ring. These rings are also provided with a recessed por-' tion M which permits the free end of the packing to have a slight inward 'movement when necessary, and thus render the same free to make close contact with the walls of the cylinder or casing within which the piston is located. At the lower end of the cylindrical portion G a lock-nut N is applied to hold the several packings and rings in position.

In the application of the invention herein illustrated the valves used upon the upper and lower pistons are substantially identical incharacter, excepting that the head 0 for the upper valve mechanism is carried by the tubular sleeve B, while the lower valve and piston which is operated by the free end of the rod A is connected thereto by any suitable coupling-for instance, a coupling-head A-which acts similar to the head 0 to form an abutment for the upward movement of the clapper K and also as a connecting means for the application of the piston.- A stem A- ex tends downward from this coupling, and as it is of a solid character does not necessarily extend entirely through the lower piston, but may be simply connected with the socket G thereof, as is the stem D of the upper piston.

The operation of both of the pistons is the samethat is, when one set of the valves is raised the other is upon their seats and in a lifting position, as'shown in Fig. 1.

From the foregoing description the operation of the several parts will be apparent, particularly by reference to Fig. 2, in which the valve occupies the position assumed when the piston is descending and the water passing upward from the hollow portion G of the piston and through the opening in the upper portion of the clapper. When this piston reaches the lower portion of its stroke, the

weight of the water upon the top of the same causes the valve to close and assume the position shown in the lower part of Fig. 1. This lower piston then begins to raise and the upper piston to descend, forcing the water upward through the upper piston, which in its subsequent movement continues the lifting action-of the water. It may be here stated that the lugs L upon the upper portion of the lower clapper K are properly proportioned in length to contact with the stem A as are all other parts of the valve. By locating the independent valve-seats in dif ferent planes a much larger operating-rod A can be used and also a stem of larger diameter, whereby a free passage of water through the space between the ribs H of the valveframe and through the clapper is provided, so as to reduce all resistance to the downward movement of the piston through the water after the initial movement has raised the clapper from the seats I and J. It will be noted in this connection that the pressure from the water to be raised is exerted in a vertical line upon each of the valve-faces, thereby holding the clapper firmly to its seat and preventing leakage in the operation of the piston, as well as materially strengthening the several parts. The form of clapper herein illustrated also possesses particular ad* vantages in its simplicity of construction and the means for guiding the same, which permit a free movement at all times and reduce the danger of sticking or clogging to a minimum.

It will be obvious that changes may be made in the various details of construction and configuration without departing from the spirit of the invention as defined by the appended claims.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. A valved piston comprising a hollow, cylindrical body having two seats disposed in different planes, an operating-stem connected to the upper seat, a cap-shaped valve or clapper rovided with portions adapted to rest upon each of said seats and having an aper ture in its top around said stem, and lugs provided upon the top of said clapper and engaging said stem to guide the valve and to provide a space between the top of the same and an adj cent contact member; substantially as specified.

2. A valved piston comprising a hollow, cy lindrical body provided with an exterior packing and at its upper portion with a valve-seat, a centrally-disposed extension from said body composed of radially disposed spaced ribs provided with an annular seat at the upper ends, a cup-shaped valve-clapper guided by said ribs to have its lower edge contact with the seat upon the body and at its top with the seat upon the extension, a fixed head above said clapper, and inwardly-extending lugs between said head and clapper to provide a space for the escape of liquid; substantially as specified.

3. A valved piston comprising a hollow, cylindrical body and'an annular seat at its upper portion, radial ribs extending upward from said body and carrying at their upper ends a secondary valve-seat and a socket, a tubular connecting-stem secured within said socket, a cup-shaped valve or clapper provided with an aperture around said stem and guided by said ribs into contact with each of said valve-seats, and a movable pistonrod passing through said stem and body; substantially as specified.

4. A valved piston comprising a couplinghead, a tubular stem extending downward therefrom, a hollow, cylindrical valve-body having an annular horizontal seat thereon, a socket for said stem supported by radial ribs extending upward from said body and pro vided with a secondary seat upon its top, a valve or clapper adapted to be guided by said ribs and to contact with each of said seats, and a reciprocatory rod passing through said stem and body and carrying a second piston thereon; substantially as specified.

5. A valved piston comprising a couplinghead, a tubular stem extending downward therefrom, a hollow, cylindrical valve-body having an annular seat thereon, a socket for said stem supported by radial ribs extending upward from said body and provided with a secondary seat, a valve or clapper having a discharge passage around said stem and adapted to be guided by said ribs into contact with each of said seats, a valve-rod extending through said stem and valve, a contact-head secured to said stem above said valve, and inwardly-extending lugs upon the top of said valve adapted to engage said stem and also said head; subtantially as specified.

In testimony whereof I afiix my signature in presence of two witnesses.

SAMUEL M. FULTON.

Witnesses:

J OHN BREWSTER, J. J. CAMPBELL. 

